Drain a Vault via Reentrancy
blockchain · medium · +50 XP
Target
GET /api/lab/reentrancy-101/state (vault balance + your balance)
POST /api/lab/reentrancy-101/attack body {depth} (simulates re-entrant calls)
POST /api/lab/reentrancy-101/submit body {drained_amount}
Goal: deposit 1 ETH, then withdraw with depth ≥ 5 (re-entrant). Vault loses 5+ ETH. Submit the drained amount.
// AI hint · first is free · then 1 credit or 5 XP
// attack console
/api/lab/reentrancy-101/
// reuse on the cli
// submit flag
// no solves yet
2 of 7 · blockchain